linux-kernel - Re: bnx2 fails to compile on parisc because of missing get_dma

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Message-ID: <20100622171445.GB8644@lackof.org>
Date:	Tue, 22 Jun 2010 11:14:45 -0600
From:	Grant Grundler <grundler@...isc-linux.org>
To:	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>
Cc:	lethal@...ux-sh.org, davem@...emloft.net, mchan@...adcom.com,
	vapier@...too.org, JBottomley@...ell.com, netdev@...r.kernel.org,
	linux-parisc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: bnx2 fails to compile on parisc because of missing
	get_dma_ops()

On Tue, Jun 22, 2010 at 03:30:08PM +0900, FUJITA Tomonori wrote:
...
> > I don't see any harm in letting drivers know whether we can support
> > consistent DMA allocs for a given struct device or not though, even if
> > the micro-optimization is marginal at best.
> 
> I'm happier with exporting less DMA APIs to drivers because looks like
> new original ways to use the APIs wrongly can be always invented.

Agree.

...
> There are architectures that need to turn off the CPU cache for
> coherent memory, I can't find none of them that see if an address is
> coherent or not in dma_is_consistent().

parisc "knows" primarily based on chipset and then checks CPU model.
We hook in the correct dma_ops early in boot before any device drivers
are probed.

hth,
grant
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